Perfect for larger individuals, the Ignition Big and Tall Chair supports up to 450 lb. and lets you customize your comfort by selecting various arm and control options. The Ignition Series from HON fits who you are, how you work and where you work with a fully coordinated line of chairs, stools, guest chairs and lounge seating designed with your comfort in mind. Pneumatic seat-height adjustment easily changes seat height from 17" to 20". 360-degree swivel on task base allows movement in any direction. Tilt with tension control and lock puts you in full control of your comfort. Versatile arms adjust in height up to 10" and in width up to 26". Mid-back chair also features a cushioned seat and back with lumbar support and fabric upholstery. 27" diameter, five-star base made of plastic. and dual-wheeled casters for easy mobility. Seat size is 24" wide x 20" deep. Back measures 24" wide x 23" high..